Invisible Gold and Other Impurity Elements in Pyrite and Arsenopyrite
Abstract—For the first time, EPMA and LA-ICP-MS data were obtained for the Kyuchus Au–As–Sb–Hg deposit on variations in the grades and zonal distribution of gold and other impurity elements in gold-bearing sulfides of disseminated ores. Two types of zoning have been found in pyrite: (1) zoning with the central zone depleted in impurities …Web
اقرأ أكثرThe mechanism of microwave-induced phase transformation
The removal of sulfur from gold-bearing pyrite caused a significant change at about 600 °C with an activation energy of 223.02 kJ·mol −1. The phase transformation during in-situ heating of gold-bearing pyrite occurred at 500–600 °C, and the crystal lattices underwent thermal expansion along the c-axis direction.Web
اقرأ أكثرThe nature and partitioning of invisible gold in the pyrite-fluid
Arsenian pyrite and/or arsenopyrite are the dominant Au-bearing minerals. Gold-bearing pyrite grains are typically zoned (core, intermediate, and rim), with multiple, oscillatory banded sub-zones. In situ analysis demonstrates that invisible Au exists mainly as cationic Au + in the growth zones of pyrite.Web
اقرأ أكثرArsenic Geochemistry of Acid Mine Drainage | SpringerLink
Due to geochemical similarity between arsenic and sulphur, polymetallic sulphide deposits and pyrite/arsenopyrite-bearing coal beds often contain exceptionally high concentrations of arsenic. Arsenic release from mine waste occurs after oxidative dissolution of sulphide minerals. Both arsenite and arsenate forms coexist in many mine …Web
اقرأ أكثرMineralogical characteristics and recovery process optimization
Pyrite and arsenopyrite are the two main gold-bearing minerals in the ALRG gold ore. The content of pyrite is 3.47 %, which is high‑sulfur lean‑iron pyrite in this gold ore, and the disseminated particle size is in the range of 0.01–0.2 mm. Arsenopyrite is the main arsenic-bearing mineral with a content of 0.45 %.Web
اقرأ أكثرGold-bearing arsenopyrite and pyrite in refractory ores: analytical
Gold bonding in arsenopyrite, examined by transmission electron microscopy, is shown to be dispersed within the FeAsS crystal structure. Typical growth patterns and As-Au diffusion zoning in pyrite and arsenopyrite may account for the very irregular …Web
اقرأ أكثرASSESSING THE ACID MINE DRAINAGE POTENTIAL OF A STOCKPILED GOLD BEARING
arsenopyrite and pyrite as the major sulphide minerals. The ABA confirmed that the gold sulphide ore could be a potential source of AMD with respect to AMD marginal of safety if the ore is left ...Web
اقرأ أكثرArsenopyrite weathering in acid rain: Arsenic transfer and
The formation of arsenic-bearing acid mine drainage (AMD) via the oxidation of arsenopyrite refuse ore has attracted significant attention. Pyrite, as main a concomitant mineral, is a crucial factor that affects the (bio)dissolution of arsenopyrite, but there are still some points on the detailed action mechanism under normal environmental conditions …Web
اقرأ أكثرArsenic Pyrite Gold Extraction by Alkaline Leaching Oxidation
A pressure oxidation procedure that has gained commercial status for treating gold-bearing arsenopyrite or pyrite employs sulfuric acid (H2SO4) and oxygen as reagents. High temperatures (170° to 190° C) and pressures (up to 400 psig O2) are required to achieve complete oxidation of the sulfide minerals. The chemistry of these …Web
اقرأ أكثرReview on arsenic removal from sulfide minerals: An emphasis on
Pyrite Arsenopyrite: Biooxidation tank reactors (Rawlings et al., 2003) Chuquicamata, Chile (planned) ... High level arsenic resistance in bacteria present in biooxidation tanks used to treat gold-bearing arsenopyrite concentrates: a review. Trans. Nonferr. Met. Soc. China, 18 (6) (2008), pp. 1311-1318.Web
اقرأ أكثرArsenopyrite-Pyrite Association in an Orogenic Gold Ore: Tracing
Arsenopyrite and pyrite are the most common Au-bearing minerals in various Au deposits (Large et al., 2007;Bi et al., 2011;Cook et al., 2013). Major and trace elements in arsenopyrite and pyrite ...Web
اقرأ أكثرTextures, trace element geochemistry and in-situ sulfur isotopes …
Metallic minerals are dominated by pyrite, arsenopyrite (Fig. 3 b–g), native gold, and minor sphalerite, galena, chalcopyrite, tetrahedrite and pyrrhotite. Gangue minerals consist mainly of quartz, ankerite, sericite and chlorite. ... Thirty-three pyrite-bearing samples were collected from the drill cores (ZK0304, ZK0703, ZK3502, ZK3507 …Web
اقرأ أكثرOrigin and significance of pre-mineralization pyrite in the
The Jinya Au deposit is a typical Carlin-type deposit in the Golden Triangle of Yunnan, Guizhou, and Guangxi provinces, China. The ore bodies occur in the Middle Triassic Baifeng Formation, which are turbidites deposited on the edge of a carbonate platform. The main Au-bearing minerals are arsenopyrite and pyrite, and previous …Web
اقرأ أكثرGold-bearing As-rich pyrite and arsenopyrite from the El Valle …
Moreover, a slightly negative correlation between the Au and Fe is observed in the compositions of Au-bearing pyrite and arsenopyrite crystals, and the Au/As values are below the solubility limit ...Web
اقرأ أكثرPhase relations of arsenian pyrite and arsenopyrite
A systematic literature-based data compilation of pyrite composition from arsenopyrite-bearing samples from 37 ore deposits (Table 2) show that this assemblage is common in orogenic gold type, but is sometimes reported in epithermal, gold skarn, Carlin-type and volcanic-hosted massive deposits (Fig. 1 b).Web
اقرأ أكثرOptimization and mechanism of gold-bearing sulfide flotation
To be common, sulfide minerals in nature, pyrite and arsenopyrite, are often associated with other metal sulfide ore. At the same time, they are also the carrier minerals of some rare metals such as gold, silver, and platinum group metals [1–3].Pyrite and arsenopyrite are the desired minerals for gold-bearing sulfide ore flotation.Web
اقرأ أكثرTreatment of a gold bearing arsenopyrite concentrate by ferric …
Bio-oxidation of a high-sulfur and high-arsenic refractory gold concentrate using a two-stage process. Zhong et al. (2013) investigated the chemical oxidation of pyrite under a pulp density of 1% (w/v) with sufficient ferric ion, and the dissolution rate of pyrite reached after 7 d. The research of Iglesias revealed that the dissolution ...Web
اقرأ أكثرGOLD-BEARING As-RICH PYRITE AND ARSENOPYRITE …
All types of arsenopyrite contain gold (1250–3000 ppm) and other trace elements such as Cu (200–1300 ppm), Sb (up to 9000 ppm) and Tl (3000–4500 ppm). This study shows that the highest contents of Au are in the As-rich zones of Py II pyritohedra …Web
اقرأ أكثرMetallogenesis of the Baidi Au-Sb deposit, southwest Guizhou
Based on its paragenetic association with pyrite, arsenopyrite was mostly arranged radially at the edges of the pyrite (Figs. 3C, 4B, and 4D), and formed later than some pyrite, which is consistent with observed sequences among Au-bearing minerals in Carlin-type Au deposits (Ohmoto and Rye 1979; Chen et al. 2009). Moreover, the Baidi …Web
اقرأ أكثرCatalytic effect of pyrite on the leaching of arsenopyrite in sulfuric
Pyrite is another common gold-bearing mineral and often intergrown with arsenopyrite [11]. The effect of pyrite on leaching of arsenopyrite cannot be ignored. According to the measured rest potentials of sulfide minerals [12], the rest potential of arsenopyrite is lower than that of pyrite.Web
اقرأ أكثرThe recovery of gold from refractory arsenopyrite concentrates by
A gold bearing arsenopyrite concentrate was characterised, and found to consist of 70% arsenopyrite and 25% pyrite with a small amount of stibnite and silicate minerals. On cyanide leaching only 6% of gold was extracted. Of the remainder, the gold associated with the arsenopyrite fraction was in solid solution, as was some of the gold …Web
اقرأ أكثرGold-bearing arsenopyrite and pyrite in refractory ores: analytical
Abstract. A multidisciplinary approach has been used to study Au occurrences within pyrite and arsenopyrite in four refractory Au ores from Colombia, France (Le Châtelet and Villeranges) and Portugal (Neves Norte). The Au was characterized by …Web
اقرأ أكثرMinerals | Free Full-Text | Pyrite Textures and Compositions in …
The ore minerals mainly consist of native gold, pyrite, arsenopyrite, galena, sphalerite, and chalcopyrite, and the gangue minerals comprise quartz, calcite, albite, ankerite, chlorite, epidote, and sericite. ... The middle-stage Py2c is also an important gold-bearing pyrite type, as its Au content ranges from 0.18 to 18.0 ppm, with a median of ...Web
اقرأ أكثرArsenopyrite
Arsenic is commonly found in sulfide-bearing mineral deposits, especially with gold mineralization. Orpiment, due to its golden color, was used in ancient times as a pigment and dye, while realgar was a common red pigment for paints and dyes. ... The overall reactions of pyrite and arsenopyrite with oxygen can be summarized in Eqs. (1) and (2 ...Web
اقرأ أكثرComplex fluid source of the multistage pyrite-bearing Huilvshan …
In both lithologies, euhedral pyrite and arsenopyrite coexist with quartz and ankerite, but chalcopyrite, galena, sphalerite and others are also present, to a lesser extent. Download : Download high-res image (1MB) Download : Download full-size image; ... the sulfur isotopic characteristics of gold-bearing pyrite, and paucity of regional ...Web
اقرأ أكثر(PDF) Arsenopyrite and As-bearing pyrite from the Roudnÿ …
Later, after particular dissolution of pyrite-1, Au-rich As-bearing pyrite-2 and arsenopyrite precipitated. These facts suggest a marked increase in the arsenic and gold activities in ore-bearing fluids. The As-content of pyrite-2 decreases in an oscillatory manner from the core to the rim, reflecting changes in the As activity or/and in the P ...Web
اقرأ أكثرGold-bearing arsenopyrite and pyrite in refractory ores: analytical
Effect of Au status on ion emission rate Comparison with EMPA analyses The SIMS depth profiles of pyrite and arsenopyrite Au-bearing grains (Fig. 7) show that the first Figure 9 shows grade profiles obtained by SIMS mineral layers enhance Au emission during the Au and EMPA analysis, superimposed for compar- SIMS analysis: steady state is ...Web
اقرأ أكثرGold-bearing arsenopyrite and pyrite in refractory ores: analytical
A multidisciplinary approach has been used to study Au occurrences within pyrite and arsenopyrite in four refractory Au ores from Colombia, France (Le Châtelet and Villeranges) and Portugal (Neves Norte).Web
اقرأ أكثرArsenopyrite: Mineral information, data and localities.
Fleet, M.E., Mumin, A.H. (1997) Gold-bearing arsenian pyrite and marcasite and arsenopyrite from Carlin-trend gold deposits and laboratory synthesis. American Mineralogist: 82: 182-193. Maddox, L.M. et al. (1998) Invisible gold: Comparison of Au deposition on pyrite and arsenopyrite.Web
اقرأ أكثرArsenopyrite and As-bearing pyrite from the Roudný deposit, …
Trace-element geochemistry of pyrite and arsenopyrite: ore genetic implications for late Archean orogenic gold deposits in southern India. Mineralogy, Fluid Inclusion, and Stable Isotope Constraints on the Genesis of the Roudný Au-Ag Deposit, …Web
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